Questions tagged [cement]

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28
votes
7answers
23k views

Pouring concrete, is it safe to add large rocks to increase volume?

Backround I'm going to pour some concrete to anchor a swing set. The base of the swing set that is being anchored is two 4x4s with a 2x4 footer crossed perpendicularly to the 4x4s. I have a bunch of ...
10
votes
3answers
5k views

What is this white powder on my foundation?

Can anyone tell me what this white powder might be? I was ripping up the carpet from my basement when I saw this underneath the padding and on the cement foundation. It's white and cakey. I at ...
7
votes
1answer
2k views

What's the best way to level this basement floor?

Goal: Level basement slab in our 1905 Seattle home so I can install laminate flooring. Existing floor: 21' x 25' unreinforced rat slab thickness varies from ~2" at rim to as little as 3/4" near ...
6
votes
5answers
27k views

How much does cement weigh after it has set?

I'm looking to make some weight plates for a home gym and so I am planning on using cement to make the plates. But I know that some water will be absorbed and not evaporated when making the cement so ...
6
votes
5answers
22k views

Is mortar waterproof?

I was advised by a professional that mortar is waterproof, however sources online are telling me that it's not. So is mortar waterproof or not? Does waterproofness vary by mortar classification (e.g. ...
5
votes
4answers
18k views

Resetting fence posts in very wet conditions

This winter the Minnesota frost heaved up 5 fence posts in my yard. I've pulled out the 5 posts, and have found basically puddles of water and very very wet mud. I shop-vac'd out the standing ...
5
votes
2answers
11k views

How to mix a resurfacer/leveler with sand and cement?

Disclaimer: No, I can't buy ready made surface leveler, because in Brazil this doesn't exist. I need to use a resurface a dry pack levelling that my previous contractor made a lousy job (porous ...
4
votes
2answers
6k views

In CLAY soil, looking for best method to set wood fence posts?

I am getting ready to install a wood fence. My problem is I have soil that is mostly clay. What is the best method to install posts in poor draining clay, giving me the best longevity?
4
votes
1answer
225 views

Why is the sand in my cement mixes so thirsty?

In making up cement-based mixtures, I always start with a water:cement ratio of 0.42:1, which is the optimal ratio. But whenever I make a mix that has a substantial quantity of sand in it (e.g. for ...
3
votes
2answers
935 views

New grout yesterday, efflorescence today - what do I do?

I just finished grouting my kitchen floor with unsanded dark gray grout (near-black "charcoal" according to the box, also it contains portland cement). Not long after the first section I started ...
3
votes
2answers
3k views

Crumbling basement walls and asbestos

I want to refinish my basement walls, as they look really bad. I tore down some wood paneling that was starting to warp, and behind that was some styrofoam insulation. Behind styrofoam is 3 mil ...
3
votes
3answers
1k views

How do I prepare exterior concrete walls for painting?

My house exterior walls are cement - how do I prep it before painting? Here's some photos. I'm thinking maybe a pressure washer but would prefer an easier, less messy alternative if available. I read ...
2
votes
1answer
1k views

Disposal of hydrochloric acid

I used hydrochloric acid and water to remove concrete from my tools (in a plastic bucket) but did not know how dangerous it was and how complicated the disposal process can be--first time using it ...
2
votes
2answers
8k views

What Cement Based Product Is Used for Smoothly Finished Floors?

I recently replaced a floor drain in my basement around which I had dug out the concrete, gravel and clay soil. When I sealed it back in, I laid down a bed of gravel and sand, and then used a ...
2
votes
1answer
2k views

How to repair my concrete slab porch.

I bought this house a few years ago, built in 1926. Not long ago, what was a slight crack in the porch became much bigger when the concrete gave way. Now I have a serious safety situation and haven't ...
2
votes
3answers
40k views

How long and how often should I water my concrete?

I have just applied cement on some stone joints, and I was wondering for how long should I pour water on it? How frequently should I apply water? Is it twice a day, or thrice a day? I really need to ...
2
votes
2answers
173 views

Removing pole and concrete base from yard

I debated between putting this question here or on SE Gardening and Landscape, but I think this question will be a better fit for this site... Let me know if I need to move it. So I'm now leading ...
2
votes
1answer
3k views

How do I calculate how much sand, cement and water I need for a specific volume of concrete?

I am using forms to build a decorative wall. The instructions say I need 38 liters total per form. The form ends up producing a wall section 200 centimeters long x 50 centimeters high. How do I ...
2
votes
1answer
312 views

Foundation Cinderblock Chipped Repair

I seem to have a fairly large chip in one of my foundation cinderblocks. Is this type of damage repairable as a DIY project?
2
votes
3answers
229 views

Method for setting 6' wood fence posts in clay soil

Background Currently in the process if planning/designing a privacy fence after recently removing the old posts from the ground. I'm now at a point that you might call analysis paralysis involving ...
2
votes
2answers
906 views

I want to mix old latex paint with ready concrete mix or cat litter to make pavers. [closed]

I want to mix latex paint with ready mix concrete or cat litter to make pavers. Trying to find a way of using approx 200 gallons of old paint since I can't dispose it. Also trying to come up with ...
2
votes
1answer
3k views

How can I fasten a threshold to concrete?

BACKGROUND A threshold was purchased from HomeDepot: The item comes with screws and needs to be fixed into concrete slab. I would like to understand how to properly screw the threshold into the ...
2
votes
2answers
186 views

How can I repair and waterproof a large crack in my foundation wall?

I recently just bought a house which was nice at first! Now after 5 month, it is now spring. We had a good rainfall which flooded my basement from the floor up because of a high water table (sump ...
2
votes
2answers
520 views

Pouring foundations in cold weather, builder didn't protect them - how to tell if it is set right?

Our builders have just poured the foundations for our house this past Friday, but did not cover them to protect them from the cold. We experienced temperatures ranging from -2 to -7 overnight during ...
2
votes
2answers
169 views

What is this cement coating?

I have this coating on my front porch which is starting to disintegrate. I think the porch slab is probably still good, so I want to just replace the coating but I can't figure out what it is. I'm ...
2
votes
1answer
533 views

Is 'bonding agent' the same as 'admixture adhesive'?

I see many tutorials regarding stucco and concrete talking about bonding agent that is applied like a primer, but there is no such thing in Brazil (I guess). What we do have is something describe as "...
2
votes
2answers
510 views

How strong are my two ten foot poles?

I have made a bat house and now I have put it up. To do so I purchased two teen foot galvanized steel poles at Home Depot, and attached them together. Where they meet I drilled a hole through the two ...
2
votes
2answers
56 views

Filling hollow blocks one level at a time

I live in an area where basic building materials are available but expensive - there are not many places to rent tools and things are done slowly by hand. It is also an earthquake zone. I am thinking ...
1
vote
1answer
100 views

Is this retaining wall failing? [closed]

The picture below shows a retaining wall. It was hard to take a picture from a good angle, but it looks to me like the wall is showing a "belly" and the seams are opening up. But I'm not sure: perhaps ...
1
vote
3answers
98 views

Can you “refresh” half-dried concrete just by mixing in water?

I mixed a wheelbarrow load of concrete (sand, cement, water) this morning, but before I could use most of it, I got called away and didn't get back until this evening, like 7-8 hours later. By now the ...
1
vote
2answers
65 views

Lard as release agent?

So I’m learning how to make concrete pavers with this youtube video. He mentions that he uses lard as a release agent, so he brushes that into the mold. He also suggests cooking oil or motor oil for ...
1
vote
1answer
62 views

Which cement or mortar will give best result when creating low water diversion barriers?

I want to build up a short dam of maybe half an inch in height, to control where water is flowing. The water flows as a small, steady trickle. Right now it fans across a large-ish area. I'd like to ...
1
vote
1answer
74 views

Recommended paint for outdoor cement patio

In my back garden, I have a small cement pad. It used to have a shed on it, but the previous owner took it with them when they left. I've decided to turn it into a sort of patio, which is working well....
1
vote
1answer
321 views

bathroom pipe joint leakage behind the ceiling tiles

There is a water leakage in the pipe joint behind the ceiling titles in my bathroom, as shown below(I glued some putty around the joint but it didn't work, the joint looks like the one on the left), ...
1
vote
2answers
832 views

outside cement wall chipped

I have a cement wall that has been chipped a little: What can happen to this wall over time? Will this deteriorate if left as is? In short: do you think it's important to fix this ASAP or this can ...
1
vote
2answers
5k views

Quikrete didn't absorb much water. What did I do wrong?

I am installing a hammock support post to support one end of a hammock. Following the manufacturers instructions, I dug a hole 18" in diameter to about 25" deep. Our soil is red clay, if that matters, ...
1
vote
2answers
45 views

Using just cement to plug a narrow channel/hole

I know that ideal thing is to use concrete, a mix of cement and aggregate (usually sand and gravel/rocks. However I have a bag of cement that's not going to go to any use, and my aim is just to cover ...
1
vote
1answer
49 views

Fixing void on face of concrete steps

My front steps are crumbling on the top. I wondered what I could do to fix this? Thanks in advance all!
1
vote
2answers
37 views

Need cement etching on inside floor?

I have a cement slab that had a plastic film and then pergo flooring. Removing this floor. Right now, I just want to seal cement and epoxy paint once I get all pergo removed. First, since I am only ...
1
vote
1answer
53 views

How to dislodge bluestones sitting in cement? (Pictures)

I need to move this wall, but I want to reuse the bluestone for the new wall. So they need to stay whole. Luckily, there isn't any cement between the bluestones- they're just sitting in it. Has ...
1
vote
1answer
35 views

What should I look for in a diamond blade?

I'm considering a 7" diamond blade for a circular saw, to be used to cut cement type pavers and short runs of concrete (driveway/sidewalk). Some blade designs are segmented/slotted, some not. Prices ...
1
vote
1answer
566 views

Filling gaps between water pipes and floor/wall - what material to use?

In my bathroom, the water supply and drain for the wash basin are exposed. The 3 pipes run along the wall at floor level, like this: There's a small gap (a few mm) between the drain pipe and ...
1
vote
2answers
2k views

How to make white portland cement stronger?

We are trying to make white pavers for crosswalks versus painting. In 2013 we made some that are still in fair shape, did not write down what we used as a formula. I think it was 3 to 1, one part ...
1
vote
1answer
1k views

Can I use EP 80W/90 oil instead of EP90 oil in a Belle MiniMix 150 gearbox?

I have a Belle MiniMix 150 110V Electric Cement Mixer the documentation says to use a EP90 oil, but these days it seems that most outlets only sells EP80/90 oil. What is the difference and doe sit ...
1
vote
1answer
122 views

Will using Redgard over a cement shower pan cause a mold sandwich if there are weep holes underneath?

I recently installed a cement shower pan but I had to use two pvc shower pan liners because of the size of the shower. I used the specified pvc cement to "weld" the two liners together at the seam. ...
1
vote
1answer
153 views

Medium-term repair for spalled foundation with exposed mudsill

I have an old house (built in 1946) near the ocean. The foundation in the back has spalled off, exposing the mudsill in some places. The worst spalling is 4" deep - you can see the mudsill and a few ...
1
vote
2answers
139 views

Can I use eye hooks in a cement retaining wall for my garden project? (Support climbing rose bushes against a cement wall.)

Here is a pic of the wall in question. Don't worry about the cracks. I already filled it in and am going to do the stairs when the weather gets drier outside. If you see the strip of soil that ...
1
vote
1answer
89 views

How to fill recess in fireplace before tiling

I wish to tile a fireplace pictured below The brickwork has a recessed area directly above the firebox (pictured below) This recessed area measures 28" x 8" x 1-1/2" I wish to tile over the recessed ...
1
vote
1answer
63 views

Did the contractor installed the new layer of cement flooring correctly?

I apologize if this is not an appropriate question. I'm not really sure where to ask or who to trust. I have a basement that the ultimate plan is to put epoxy, but before we can get to that stage, ...
1
vote
1answer
155 views

cement cracked around mailbox

I cemented my mailbox to hold it steady but the cement cracked and now it is wobbly. Does anyone know why that happened? I probably need to dig the concrete out and replace it with new concrete and ...